Systematic study of the superconducting and normal-state properties of neutron-irradiated MgB₂

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R. H. T. Wilke, S. L. Bud'ko, and P. C. Canfield
Ames Laboratory US DOE and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA

J. Farmer
Missouri University Research Reactor, University of Missouri–Columbia, Research Park, Columbia, Missouri 65211, USA

S. T. Hannahs
National High Magnetic Field Laboratory, Florida State University, 1800 E. Paul Dirac Drive, Tallahassee, Florida 32310, USA

Received 7 July 2005; revised 16 February 2006; published 14 April 2006

Wehave performed a systematic study of the evolution of thesuperconducting and normal state properties of neutron-irradiated MgB₂ wire segmentsas a function of fluence and post exposure annealing temperatureand time. All fluences used suppressed the transition temperature, T_c,below 5 K and expanded the unit cell. For each annealingtemperature T_c recovers with annealing time and the upper criticalfield, H_c2(T=0), approximately scales with T_c. By judicious choice offluence, annealing temperature, and time, the T_c of damaged MgB₂can be tuned to virtually any value between 5 and39 K. For higher annealing temperatures and longer annealing times, therecovery of T_c tends to coincide with a decrease inthe normal state resistivity and a systematic recovery of thelattice parameters.

URL:	http://link.aps.org/doi/10.1103/PhysRevB.73.134512
DOI:	10.1103/PhysRevB.73.134512
PACS:	74.70.-b; 74.25.Fy; 74.25.Ha; 74.25.Sv 74.70.-b Superconducting materials 74.25.Fy Transport properties of superconductors including electric and thermal conductivity, thermoelectric effects, etc 74.25.Ha Magnetic properties of superconductors 74.25.Sv Critical currents in superconductors YEAR: 2006
KEYWORDS:	neutron effects, type II superconductors, magnesium compounds, annealing, superconducting transition temperature, superconducting critical field, electrical resistivity, lattice constants

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